Knock-out bottom



w. SALISBURY I 7 KNOCK-OUT BOTTOI Filed Aug. 29, 192B 1 N VEN TOR. Milk/7 '5 oh'almpy ATTORNEY.

; UNITED STATES A N Q F CY PatentedSepte9, 1930 t r H i a 1,775 537,,

WILLIAM SALISBURY, or TOLEDO, omo

xnoox-oirr BOTTOM 1 i j Application filed August 29, 1928. Serial 110.302, 742, j j 1 Myinvention relates to a new and useful die 8, and of the proper thickness." After! improvement in a knockout bottom used parthe spinning operation itis. desired that the ticularly in the pottery industry for removing formed article in the female die 8 may be the formed pots, or other receptacles or reremoved therefromb Supported on theintainers, from the female die afterthe spinner wardly projectingfiange 9 of the die 8 is a 5 has performed'its function and has raised flange 10 projecting outwardlyfrom therefrom operating position relatively to the tainer 11, to serve as supporting meansfor worked material. In knockout bottoms as the retainer whenthe die isinpot forming commonly used the bottom which contacts position. This retainer member is threaded 10 with the pot, or article to be formed, is usually onto the knob 12, in which is threaded the 60 held non-rotating. actuatingrod 13. The bottoml iis provided It is an'object of the present invention to with the centrally extendingshaft 15, which provide a knockout bottom which may be rois fixedly mounted thereto and which extends tatable relatively to the support therefor. through the bushing 16, positioned in the re 1 It is another object of the invention to protain'ing member 11. A bolt 17 is threaded 6 vide a knockout bottom which will permit the into the lower end of the shaft and engages forming in the bottom of the pot, or recepa washer 18 which engages the end of the tacle, perforations spaced outwardly radially bushing IGIApluraIity of slidable'pins" 19 from the center of the pot, or receptacle, and are projected through the bottom 14, each of 29 still permit the formation of the pot, or rethese pinsbeing provided with a head 20 ceptacle, on the automatic machines used for which engagesthe disc 21, having the boss 22 this purpose. which engagesin a peripheral groove formed It is another object of the invention to proaxiall in the bushing 16. Secured to the vide a knockout bottom having a plurality of end 0 the retainer 11 andproj ecting upward- 1 s 25 perforating members projected therethrough ly therefrom in spaced relation are leaf and normally retained in position for pene-' springs 23 which engage the under surface'of trating the pot or article to be formed. the disc 21 and serve to retain the pins 19 Itis another object of the invention to prothrust outwardly beyond the outer surface of vide a knockout bottom which will be simple the bottom 14. The bottom 14,togetherwith a 550 in structure, economical of manufacture and the shaft 15, is rotatablerelatively to there scribed and claimed.

highly efficient in use. tainer 11, thus carrying the pins 19 rotatably,

Other objects will appear hereinafter. so thata .pot placed inthe die 8; and through a The invention consists in the combination the bottom of which the pins 19 may project,

and arrangement of parts hereinafter dewill, if and when rotated by the spinner, carry 1 i a with it therotatablebottom 14,so that the Th i n i n W be best p q y perforations formant-h bottom of the pot.

a {defence to the mp y f dfawlngs will he the size of the pins19 and no deformaform a P of t speclficatlona and tion eifected The-springs 23 give the neces 1n whlch, sary yieldability to the bottom 14., and it will Fig. 1 is a side elevational view of the inbe noted that the bottom of the screw 17 is 1 Fig. 4: is a view taken on line 44 of Fig.

vention showing it applied.

Fig. 2 is a top plan view of the invention. V a Fig. 3 is a sectional view taken on line 3-3 of Fig. 2, and

spaced from the end oft-he member13 so that the shaft-'15 may be, if required, moved axiale. ly relatively to the, retainer 11- against the a tension ofthe springs23. i a p In the drawings I have illustrated a table 7 Wlth t. bottom, formed m in on which is Supported the f l di 8 i manner the formatlon of articles, or conta ns which a spinner (not shown) is adapted to en- S l B and the l h -P y gage for spinning and forming the plastic maf PBDIDgS 1n the lease may befabrlcated on. V a a 50 terial to conform to the shape of the female the automatic machines now customarilynsed 10o and an economical construction of such articles effected.

Vhile I have illustrated and described the preferred form of my invention, I do not Wish to limit myself to the precise details of structure shown, but desire to avail myself of such variations and modifications as come within the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A knockout bottom of the class described, comprising a retaining member, and a knockout bottom rotatably mounted on said retaining member and axially moveable With respect thereto. 7

2. if knockout bottom of the class described, comprising a retaining member, a knockout bottom rotatably mounted on said retaining member and axially moveable with respect thereto within predetermined limits, and a plurality of perforating members projecting outwardly from one face of said bottom.

3 A knockout bottom of the class described, comprising a retaining member, a knockout bottom rotatably mounted on said retaining member and axially movable with respect thereto Within predetermined limits, a plurality of perforating members projecting outwardly from one face of said bottom, and yieldable means for normally resisting axial movement of said bottom in one direction. 7

4. In a knockout bottom of the class de scribed, a retaining member, supporting means therefor, a rotatable bottom supported by said retaining member, pins projected through said bottom and extending normally above the upper face thereof, and resilient means carried by said retainer for maintaining said pins in operative position on said bottom.

5. In a knockout bottom of the class described, a retaining member, supporting means therefor, a rotatable bottom supported by said retaining member, pins projected through said bottom and extending normally above the upper face thereof, said pinsbeing free for axial movement, an engagement member for engaging the lower ends of said pins, and resilient means carried by said retainer and engaging said engagement memher for maintaining said pins in normal position.

6. A pottery forming die, a rotatable bottom, a support for said bottom, said bottom being axially shiftable as to said support.

7. A pottery forming die, a rotatable bottom, a support for said bottom and spring means between said bottom and said support.

8. A pottery forming die comprising a rotatable bottom having a depending shank, a retainer forming a bearing in which said shank is rotatable and axially shiftable, and resilient means between said bottom and re tainer.

9. A pottery forming die comprising a rotatable bottom having a depending shank, a

lVI'LLI AM SALISBURY. 

